Add state change test for uniform buffer validation.
Add state change test for uniform buffer validation.

Bug: angleproject:2747
Change-Id: Ia808e26a48ecf432cc29ebd8514f265ff3e15ce8
Reviewed-on: https://chromium-review.googlesource.com/1169825
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle